php通过修改header强制图片下载的代码

1. unction downloadFile($file){
2. $file_name = $file;
3. $mime = 'application/force-download';
4. header('Pragma: public'); // required
5. header('Expires: 0'); // no cache
6. header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
7. header('Cache-Control: private',false);
8. header('Content-Type: '.$mime);
9. header('Content-Disposition: attachment; filename="'.basename($file_name).'"');
10. header('Content-Transfer-Encoding: binary');
11. header('Connection: close');
12. readfile($file_name); // push it out
13. exit();
14. }

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php, header